ddi_iomin(9F)

Name

Synopsis

Interface Level

Solaris DDI specific (Solaris DDI). This interface is obsolete.

Parameters

dip

A pointer to the device's dev_info structure.

initial

The initial minimum DMAtransfer size in bytes. This may be zero or an appropriate dlim_minxfer value for device's ddi_dma_lim structure
(see ddi_dma_lim_sparc(9S) or ddi_dma_lim_x86
(9S)). This value must be a power of two.

streaming

This argument, if non-zero, indicates that the returned value should be modified to account for streaming mode accesses (see ddi_dma_req(9S) for a discussion of streaming versus non-streaming access mode).

Description

The ddi_iomin() function, finds out the minimum DMAtransfer size for the device pointed to by dip. This provides a mechanism by which a driver can determine the effects of underlying caches as well as intervening bus adapters
on the granularity of a DMA transfer.

Return Values

The ddi_iomin() function returns the minimum DMAtransfer size for the calling device, or it returns zero, which means that you cannot get there from here.